21510853260 has 192 divisors, whose sum is σ = 65724288000. Its totient is φ = 5225223168.

The previous prime is 21510853241. The next prime is 21510853261. The reversal of 21510853260 is 6235801512.

It is not an unprimeable number, because it can be changed into a prime (21510853261) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21575082 + ... + 21576078.

It is an arithmetic number, because the mean of its divisors is an integer number (342314000).

Almost surely, 2^21510853260 is an apocalyptic number.

21510853260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21510853260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32862144000).

21510853260 is an abundant number, since it is smaller than the sum of its proper divisors (44213434740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21510853260 is a wasteful number, since it uses less digits than its factorization.

21510853260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360 (or 1358 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 21510853260 in words is "twenty-one billion, five hundred ten million, eight hundred fifty-three thousand, two hundred sixty".